I have a question regarding each Data Guard protection mode.

Hello.

I wrote this because I have some questions regarding the Oracle Data Guard architecture.

While checking the behavior of each protection mode in the test environment, I found that the actual results differed from what I had understood from the documentation, so I wrote this to better understand the exact architecture.

I would appreciate your advice.

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Environment

Primary↔Physical Standby, single instance × 2

Separation of the DG-dedicated network (redo transport 1522 / operation 1521)

Using Broker, FSFO + Observer configuration

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We conducted a test to verify the effect Primary receives when the protection mode changes, but the behavior we understood from the documentation differs from the measured results, so we would like to verify it from an architectural perspective.